ARM Compiler toolchain Using the Linker - ARM Information Center

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7.21 Steering file command summary 7.21.1 See also The steering file commands are: Command Description Accessing and managing symbols with armlink Note The steering file commands control only global symbols. Local symbols are not affected by any of these commands. Tasks • Specifying steering files on the linker command-line on page 7-24. Concepts • What is a steering file? on page 7-23. Reference • Steering file format on page 7-26. Linker Reference: • EXPORT on page 3-2 • HIDE on page 3-3 • IMPORT on page 3-4 • RENAME on page 3-5 • REQUIRE on page 3-7 • RESOLVE on page 3-8 • SHOW on page 3-10. Table 7-6 Steering file command summary EXPORT Specifies that a symbol can be accessed by other shared objects or executables. HIDE Makes defined global symbols in the symbol table anonymous. IMPORT Specifies that a symbol is defined in a shared object at runtime. RENAME Renames defined and undefined global symbol names. REQUIRE Creates a DT_NEEDED tag in the dynamic array. DT_NEEDED tags specify dependencies to other shared objects used by the application, for example, a shared library. RESOLVE Matches specific undefined references to a defined global symbol. SHOW Makes global symbols visible. This command is useful if you want to make a specific symbol visible that is hidden using a HIDE command with a wildcard. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 7-25 ID080411 Non-Confidential
7.22 Steering file format 7.22.1 See also A steering file is a plain text file of the following format: Accessing and managing symbols with armlink • Lines with a semicolon (;) or hash (#) character as the first non-whitespace character are interpreted as comments. A comment is treated as a blank line. • Blank lines are ignored. • Each non-blank, non-comment line is either a command, or part of a command that is split over consecutive non-blank lines. • Command lines that end with a comma (,) as the last non-whitespace character is continued on the next non-blank line. Each command line consists of a command, followed by one or more comma-separated operand groups. Each operand group comprises either one or two operands, depending on the command. The command is applied to each operand group in the command. The following rules apply: • Commands are case-insensitive, but are conventionally shown in uppercase. • Operands are case-sensitive because they must be matched against case-sensitive symbol names. You can use wildcard characters in operands. Commands are applied to global symbols only. Other symbols, such as local symbols, are not affected. The following example shows a sample steering file: ; Import my_func1 as func1 IMPORT my_func1 AS func1 # Rename a very long function name to a shorter name RENAME a_very_long_function_name AS, short_func_name Tasks • Specifying steering files on the linker command-line on page 7-24. Concepts • What is a steering file? on page 7-23. Reference • Steering file command summary on page 7-25. Linker Reference: • EXPORT on page 3-2 • HIDE on page 3-3 • IMPORT on page 3-4 • RENAME on page 3-5 • REQUIRE on page 3-7 • RESOLVE on page 3-8 • SHOW on page 3-10. Example 7-4 Example steering file ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 7-26 ID080411 Non-Confidential
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® ARM Copyright © 2010-2011 ARM.
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Contents ARM Compiler toolchain Usi
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Contents 7.15 Creating a symdefs fi
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Chapter 1 Conventions and feedback
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Chapter 2 Overview of the linker Th
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Concepts • Demand paging on page
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2.3 Linker command-line options lis
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• --keep_protected_symbols on pag
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• --eager_load_debug, --no_eager_
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2.5 What the linker outputs 2.5.1 S
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Chapter 3 Linking models supported
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3.2 Bare-metal linking model 3.2.1
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Linking models supported by armlink
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3.5.1 See also • There are restri
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3.7 Concepts common to both BPABI a
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Image structure and generation •
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4.1.1 See also Image structure and
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4.3 Load view and execution view of
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4.4 Methods of specifying an image
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4.5 Types of simple image 4.5.1 See
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4.10 About specifying an initial en
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4.11.2 Example 4.11.3 See also The
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4.13 Section alignment with the lin
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Reference Linker Reference: • --a
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4.16 Overview of veneers 4.16.1 See
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4.18 Veneer types 4.18.1 See also I
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4.20 Reuse of veneers when scatter-
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4.22 About weak references and defi
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BL init_foo ;Rest of code END 4.22.
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Image structure and generation 4.24
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4.25 Specifying user libraries when
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4.27 Use of the strict family of op
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5.1 Elimination of common debug sec
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Page 81 and 82: 3. Creates the output image. 5.7.3
Page 83 and 84: 5.9 How the linker chooses a compre
Page 85 and 86: 5.11 How compression is applied 5.1
Page 87 and 88: 5.13 Inlining functions with the li
Page 89 and 90: Reference Assembler Reference: •
Page 91 and 92: 5.16 About reordering of tail calli
Page 93 and 94: 5.18 About merging comment sections
Page 95 and 96: 6.1 Linker options for getting info
Page 97 and 98: 6.3 Example of using the --info lin
Page 99 and 100: 6.4 How to find where a symbol is p
Page 101 and 102: • Load$$LR$$ load region symbols
Page 103 and 104: 7.2 Accessing linker-defined symbol
Page 105 and 106: 7.4 Image$$ execution region symbol
Page 107 and 108: 7.5.1 See also Accessing and managi
Page 109 and 110: 7.7 Region name values when not sca
Page 111 and 112: 7.9 Importing linker-defined symbol
Page 113 and 114: 7.11 Section-related symbols 7.11.1
Page 115 and 116: 7.13 Input section symbols 7.13.1 S
Page 117 and 118: 7.15 Creating a symdefs file 7.15.1
Page 119 and 120: 7.17 Reading a symdefs file 7.17.1
Page 121 and 122: 7.18.2 See also 0x0000814D T __argv
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Page 129 and 130: Using scatter files • Images with
Page 131 and 132: 8.2 When to use scatter-loading 8.2
Page 133 and 134: • --startup=symbol, --no_startup
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Page 137 and 138: 8.5.1 See also } SRAM 0x8000 0x8000
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Page 141 and 142: 8.9 Creating root execution regions
Page 143 and 144: 8.9.2 See also Tasks • Using the
Page 145 and 146: 8.11 Placing functions and data at
Page 147 and 148: Using scatter files RAM 0x200000 (0
Page 149 and 150: Using scatter files • Using __at
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Page 153 and 154: } } .ANY1(+RO) ; evenly distributed
Page 155 and 156: 8.14 Examples of using placement al
Page 157 and 158: Using scatter files 8.15 Example of
Page 159 and 160: 8.16 Examples of using sorting algo
Page 161 and 162: 8.17 Selecting veneer input section
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Page 165 and 166: 8.20 Restrictions on placing __at s
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Page 169 and 170: 8.23 Placing a key in flash memory
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8.27 Example of placing code in a r
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8.29 Example of placing ARM C++ lib
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8.31 Reserving an empty region Usin
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8.32 About creating regions on page
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8.33 Overalignment of execution reg
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8.35 Expression evaluation in scatt
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8.37 Equivalent scatter-loading des
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Using scatter files Example 8-23 Po
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Using scatter files Example 8-25 Po
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Using scatter files • The ER_ZI e
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Using scatter files Example 8-29 Sc
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Chapter 9 GNU ld script support in
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9.2 Typical use cases for using ld
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Reference Linker Reference: • --l
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9.5 Recommendations for using ld sc
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.data : { __data_start = .; *(.data
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9.6.4 See also .got 0 : { *(.got.pl
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9.7.1 See also } .dynamic : { *(.dy
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9.8.1 See also { *(.bss .bss.*) . =
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Chapter 10 BPABI and SysV shared li
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BPABI and SysV shared libraries and
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10.3 Concepts common to all BPABI m
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10.5 Symbol visibility for BPABI mo
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10.6 Automatic import and export fo
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10.8 Symbol versioning for BPABI mo
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10.10 Linker options for SysV model
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10.13 Addressing modes in the SysV
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10.17 Linker options for bare metal
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10.21 Addressing modes in the BPABI
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10.23 About symbol versioning 10.23
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10.25 Example of creating versioned
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10.27 Linker options for enabling i
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Chapter 11 Features of the Base Pla
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Features of the Base Platform linki
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11.2 Example scatter file for the B
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Features of the Base Platform linki
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Change Topics affected Revisions fo
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